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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcc8b52caad5d609fc113de8dd1d93a21b2ac65af51e83c30b058dfd0ee2f33' 
  AND token = '8pkSUotdDifx1dg5gNEH5cKLQI6yCZppJnlwv035rQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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