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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b741710164f485389adcd8fc013c580b96d5e91b7c0325b6292bcf399f784c6' 
  AND token = 'hxnSiPVbXpNTYkYnhtHImAswStM2F4Nia6Y10fiPqUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00658

JSON explain

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