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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e081e7cc10e64a85b8c8d7cf1fcc508ce9d90a64f5b71dc572ec079fe01b4d' 
  AND token = 'hYx3obbEzhAwviu6qsygpJB74z/nmrVJWZemN8OcH8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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