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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c671877a85263c17735b7ef793554c3ac4879e8b0087f48c8c446f4c349e86b0' 
  AND token = 't13fUoY50GvUpaXJyelTBr/tFSEMsVYDXGTo12hUZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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