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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4624898202fb6d384033b321290824d2d00269c695ebf59a61c216a6c59b1f88' 
  AND token = '5zqfWdozA0J0HrIZrnWOM2vxwsyqbzf/PrbPZAxPMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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