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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bc837feee15a62af27955027ea7d60ca5dbb5ae4142c540b515c22ab8079c5' 
  AND token = 'v4vwXL7yMoce6vso1505tkRxgGuA5iW0bhRq3AFsq9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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