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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbe21cbc9ec40db33bd7d048f352923d9541465026306c93b5bedbbcc48efd5' 
  AND token = 'tZOper7SOuRn/X7Yt5LgE2zyhCnv3O+44SCwc3MS1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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