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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1004bed6614f4dc9e6a06585ea9ee47867c03e285d7a439d6cc86a75578dab79' 
  AND token = '92UixLZcD6Dv+M9DsoMIMhSDAD2xZJScKG3bD+n3FHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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