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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff61a52774f1239b8e3edb0508a95149819ce3732e1d05ac3d32a8fc7404f67f' 
  AND token = '/ICSVLNnuZuNqb4sqFixBNfnkRWYYmtuBEuxMF2uCCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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