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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66e80680e359560fcc74f3eebf8af59b63721640937014a8f1685a80a83654c' 
  AND token = 'gGR1x1mkGmrCh8NRUIi1pQhWWYy91hF+HtaFG6IADMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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