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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cad71e6934660c985c7b075a814f42ec4084ae785188ec75535d892f0cd633' 
  AND token = 'LRoEr0s+0sfEQC3gnmyVp0kFWH35+kv72QEV281Op78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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