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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807e50012015500f3ca5e1123c1c48ed749881f290d2647acda1c5f903620685' 
  AND token = 'VLZZEwCioL8qXreKAK1/Y4JeX7l1JaI/9QKJZYaRUHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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