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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8cb0331f696a0113b6d232a4dbb70c37e12eef09b970df5b157b6bd9ce025c' 
  AND token = '9oG/5ILWxojS0vY/2Tk7AcAI976F70xVpxNPzM9Am9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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