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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b6c9df8d4951b182e8fcf08ad06ef4a8b26d3777d032b1fbf250943c2589d0' 
  AND token = 'Yn73r8777ckZch01TKLoCUxJogotSWcIlcfLvi6vE4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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