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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbc1009c268b5b6a18dabc2592e8ba0afedfa4133f6093980ef5deee90f26e1' 
  AND token = 'TxmbO5bO2hjZTN1/MlNnW8ru80pPjckA0E/ks6jA0pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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