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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cdf0baffb4a9f1b505d8b6099fe7d467db90f012dba32d22780b47e0dcfa7e' 
  AND token = 'sf9c523nw39b3/9ROZiIeLY4LWB0FTC1w75Q9H1a8LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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