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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8f8efdd317eb367de13b92644eb922f885ff2e2b66ebb61e32385b0e98bafe' 
  AND token = '2fA5F6h9t7uq0uLKp/VjUH3cPvRUxYuMpbCdNgpgeL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}