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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63f83b7e06880e601603f8c16234983ced1f3c363e6d2dbd3b51624ec58e4bb' 
  AND token = '6jEC5Ek+mCJapQUSRK+0MiL9dr/NvDpQzi9EnZqVF6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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