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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a8b00d2433ad98db0dcabf7282d07bc1c2556b4ce716f112765cda61a894b7' 
  AND token = 'NsgRny7kGrWuj3VzBY9CDfNYU7e7gnHIalWJfSO6JQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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