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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f9c041501b67b351e74fa56e8b5fc8d31341a118a96cfbeb18756257f69cc3' 
  AND token = 'Cxg8vy7u99eqhrQtxIQVWoNgI0rigq+4qMozeEnyC9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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