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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd674388325884938403a16d5d13a010bd29af25436ef2516472f67410cb8044a' 
  AND token = '6L0FS/oD+gJ9Q/1shYzoVoCCecOOTp0N28SlAD4Mm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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