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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812c87ee0f796c4f97ec7bd8cc18940ff52a9c5aed6314b221ca5b00ac091975' 
  AND token = 'tkbVNTbwRKplenyD1khtc0nv+89Zumsl987AFvpKxAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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