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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bf58bd67ce9309f8319c0a9f11b39b70b0a03cc9216623564bed3897910d06' 
  AND token = 'WFoPwa1zdPiZBzU3oTgbkiIUDfpBBQcTV6vTmU1j8tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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