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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db7368f5391c164e4ab2f6e12195573699fd5142df54b435d303d3b3068cd08' 
  AND token = '8USAV1LrrR9oiE6j487lFKsQhmhl4HJhMN4DABweX00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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