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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8632915ec71fee4d28903a3fdacaa58f147f30806fdf9510c9e3378f0fe03e' 
  AND token = 'vvEGTDu7/HbWC9rH0DlK8sDcwlkKHYc3+UySN/x2vVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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