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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea09a693298e8e1a973828b258b252d4c38e7da7229962ab137fb7255071a253' 
  AND token = 'QkfRMrgt7HBBlz2IPBqKQuzshmtbxhsZz0B9tOYvgRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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