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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b492a1fe8a5b4f294eaf827936e5ff61b087a5a9954493f3146f9947f9dea583' 
  AND token = 'jGaJK8YWMob6fcLJYbp6k1Ski5vHU/Y9IZCK1w0WfyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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