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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0d9221b25ef9c02c4ce310b1d13c1b18770eb70ea6cc5435c87d5692c587df' 
  AND token = 'h21kRN6cctx53TdIV1eQPGpH11rxe8KhcJoQfJva6NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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