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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ad487ecee0cf804bd288059a99f32ad7af21c08e387cbc5ee33e7eb9e91007' 
  AND token = '57Lkx0riV7riW6CJHtI5ZqUF04lBMCN5iFwLzBEbtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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