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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad7597cd166b19ba05f050c0bf02feac7556a1c92e3803917d49495b85588ae' 
  AND token = 'x5nVTdri50axENp2ctJnekqEk+h9sdRvfi8NLVzilnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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