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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934aac008f669e709213959e360294487455d9ab61f11d8529c147018846f275' 
  AND token = 'yim2PITa8J0xc1O9nF7X5yK7mHW74H06DSb4d0xUDy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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