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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ba3b9c88f1282fd69071200b50bae76b94391b45c9493198d053a17a49c1ff' 
  AND token = 'kBGK5OnTH+Bf5kLOaiDm5Vz8VUQo6bQSg/De4RkD7Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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