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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8db6020dcd3ec228506aff478a1c26afd2ff9c1ea3e2ccc02678dd3c5a83d6' 
  AND token = 'WRCv4azgbqdo6Urdbq3+w2rGd99e+afcrKLYq/zrJYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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