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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8955e623e6b1ac2795b638b95a34c8494cef02e12d03239f96e38d85fe8f963f' 
  AND token = 'o77ONUUXng804goz2kPHerCL7BZzb7u5APL+UhsE+yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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