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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f807a46920023b0f72b23077cf92d33f76ba73a5ef3d761f64c8f9a7650fd3b' 
  AND token = 'ACxjh+8rFv37WMRwR+wDmfwXncmvnDQW55Vpgdll2O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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