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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368cf21b5aa4c0c09d9d971b359b1556197975968347fc4dd1dcb7c46b26a1a1' 
  AND token = '5pak1QyGOOSsFIizlV2i0QV6g837QV+Hxj1n/ZbUAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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