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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a6e18ded89db7a0b0226fcae23768e1c37941f3bd04f9fef2082dc5fb21960' 
  AND token = '1kMHZnBWBJMycel030meJCfMFSj4uPOE3LUPvotRNlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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