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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108f3c0b5a1edffb6b52d9c14481d1b092a678647fe14d1dbde86f4e97a2c44e' 
  AND token = '3ooXsEZJ3wKUA2Ytz/GqdbkZE1X+eQ5Gl2nHzSBYEco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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