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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7322e97d88d3e8473fca730abbb44ab3ac62a9dcc53d97cd20109fb5c3eae56' 
  AND token = '57m1cL5bnfLFJWRRqdCY7oBe+9DMD+rt21DWW+k5KIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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