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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c141962fd4290dd72a319fc9c67637d3d4344667f0d080cb3962252f334d51d9' 
  AND token = '2uuL/ljoLROxE87eU9jIy84xL+nFCRN8w31uE1oM4Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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