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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64940914eaf1c70b45d565691b9db3b195f9f9fbcf6273067dc6005b2a6587a6' 
  AND token = '3JIuc2esZSO3ycffaOJU7Bi8x2HmJunSlxzHViaQM9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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