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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca87ac4c08d2d7fb89789b997d85dab19596110693479c70b5e50790e1354888' 
  AND token = 'T5nbhL6r3yFYRBvb29ypi87a0gT9W4dGR5otwrL1B04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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