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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081be04d440785f6090003203d9d4316af4c4a8aec386c5530a30bb4fe688445' 
  AND token = 'h0wV7TUSRAkUZR45fanovYGcf4IQb6BM8oLoKf5cATg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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