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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd314706713b86d0e5f175f146ba97191f6a1304ba9311e66d6cf27b0ee3736b' 
  AND token = 'T9k8LeOhnu/tEdQoPCFz+b28irsauE19Qb4qk6SedM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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