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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c411973c9a5d74caa4b555aebaa334e88271fc875c8e41de4deafc68f2ec90dd' 
  AND token = 'wk8Xqagm+lGm1q13TOJtYzRfUWD7dd90RK0GmgS6pP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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