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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bad024618c893561a891a122baa748231812dc587b6832bfe37ccf2995e733c' 
  AND token = 'w9byCL8TICN3k2d7F5cVj970g4X7t7V+QpUY/7kJCpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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