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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12ca5b44c8747a0564c6487dc235f2c24f8e9b150e3cc6420358ae6b06e7f56' 
  AND token = 'pLzJpLfJOQ5xISkTA2Yxj0qCQZTBQ/9lvC6S9g/gSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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