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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d749a07bf2758cf39fcd049c435ea9ef98bc2ab18dac6250b3d31ab7b6c23df' 
  AND token = '08HV/eJ04pjtT57IiDo0c5kh78X6PyIlNum8QOkUOhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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