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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198d6c6b4c3d541a4d8a66fa770d6c9f1e4b682a7990ebbd5757b4eecc2bb095' 
  AND token = 'MpJymHKQ7SKqc3GJ1tYMUQcus/yLI8AHgN+CfgVb74g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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