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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876a43b90e3dc9256b0c868d839783272c4d64d5fb32d555ccf0dee80b64363b' 
  AND token = 'Yb5Ck+MosgDawVqEFJcVdg9a1VLCwO6noC/663uXJxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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