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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0bcbe86aa6e0373edc752dc92754ac4d297c222a8b6bc1fafa23df60af6e48' 
  AND token = 'M6doRVgKbhRcVOnqiIu9wo8gNZPOM8Iqbs2Ya1hqkPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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