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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f904df2dc4d12cbafcb4920bd84903856602ace424d39d1d7873efd1dcafc25' 
  AND token = 'GS+mndg44nzFlqyafYS6mqhiz8mabN/LDQGysa4O3Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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