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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05882d31586e89a7bd57b9f437205b9f1cefcd1810464cb8f3e6a0bdd10f8ba8' 
  AND token = 'i/BjOPeVdwuKWAbfUcSV+onUheS6d0s7usMXImDKhpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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