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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6922cf26a53453e03964555ba4488b56a254ac44a8eb4a7f4def3548bce2196' 
  AND token = '/veiB6NzLmcpOb4MIhS7l9OuO4ox49BMOeL9B2Ct+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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