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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaf74e51a28434239304d978e9abace8074cc079f07eee29eb093a53a6aeb47' 
  AND token = 'yyG1vY2VSmDPoyd54pmDzlPY7tkUw2EdMe78ZTU3S2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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