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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6593f7460530f346dbe9df77656cd7abff098f456be0e1c6c3a4bc868aaa32' 
  AND token = 'DpW4p92KHcSNX3chlDnqwMY0ty5p8M5DWFw+G/fvSls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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