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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d84da11ec69b69b8922aa59cd35c39164a80e4d8b7f10d029c9af13ac9e706' 
  AND token = 'OZqyZUCRTDyUNPdr7UqQKhyv6We4iUzdEL4dv465yqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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