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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62629d21af61aebac4cc4e7b253461de54a9d3bbe22fd3dce1e60e564a2b4ec3' 
  AND token = 'eZ7301CFNwnTx2mZZIBPyuVoYsp6Woh39E7+eJddUrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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