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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ea183a463acb4ed9715919f13e52e982090cd21582fa9f0126081fd7aa2008' 
  AND token = '5o5CvGkEBvVnrm5eUjGS6CD/5WdPBS14ikLQ2/4LHUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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