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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef72592327b2be1d2066e0331a40bc9929cf494ba0abe43d2e0129cb86a2c1d' 
  AND token = 'S1M72iDB3Bg06TmfUE1MTY12VaTdTJ0zPiGESmhbZ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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