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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac93f0bcc0e9f397021c3b2b6dd8eb3f77c842f52d8e0d89b31afd42a0fd22d' 
  AND token = 'AlNdFo2eENE3g7M98H8ZNXmfjWM+Heu+Rsuo9BBjzSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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