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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ae714978cf925d48516f96c23e93d31efafc52e38110997ecf44cc8fbb67da' 
  AND token = 'pbxGoRS2BnduSULiwq1p8dMiVM1BOTBV/vWSpwx0dzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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