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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b504362894f49f6348d4946aa1f0ff38671eeb5088a855aede4ecf809afa1cc2' 
  AND token = 'rpzgxWTy/2Iz0cLbs+ym2j1yyUbh5R4ygqT3eXt++gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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