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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8ef3fa2af1ebc4e9c1f9f41f466bf47bda9e501ab82f08c7c8bee79f1ec6aa' 
  AND token = 'fl74/4oZgzteOW7p0mBsaeUBXVy4x0a2VA6TTj1mnH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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