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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8bd30f625bdd31c29d22feb6bb3b6215b7cafe0b6a7dd1672a939aa3f53e71' 
  AND token = '9IRqw86xt6JIxzJgbVogSn0sQvYfXlzKkdjcDulz3+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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