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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7423656e7a3471439f1d4ba7c1aafe0399fb9aae3b5df138375fa6069ae0f76' 
  AND token = 'hWI5PoNqhoqt5097tYxrq4pb6E3cxSvb8P01VzlxPyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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